Cut the bacon into fine strips and fry them in 2 tablespoons of oil until crispy. Add onions and sauté until translucent. Add the mushrooms and chanterelles and cook until the liquid has evaporated. In the meantime, fry the steaks in 3 tablespoons of hot oil for about 2 to 3 minutes on each side, season with salt and pepper and remove from the pan. Deglaze the roast with wine and stir in the creme fraiche. Pluck the basil leaves and add to the mushrooms and sauce. Season to taste with salt and pepper.